US6134851A - Encapsulated window and manufacturing process - Google Patents

Encapsulated window and manufacturing process Download PDF

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Publication number
US6134851A
US6134851A US09/125,965 US12596599A US6134851A US 6134851 A US6134851 A US 6134851A US 12596599 A US12596599 A US 12596599A US 6134851 A US6134851 A US 6134851A
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United States
Prior art keywords
window
substrate
frame
plastic material
thermoplastic
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Expired - Lifetime
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US09/125,965
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English (en)
Inventor
Jean-Pierre Roze
Pascal Lefevre
Gerard Huchet
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Saint Gobain Vitrage SA
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Saint Gobain Vitrage SA
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Assigned to SAINT-GOBAIN VITRAGE reassignment SAINT-GOBAIN VITRAGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUCHET, GERARD, LEFEVRE, PASCAL, ROZE, JEAN-PIERRE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J10/00—Sealing arrangements
    • B60J10/70—Sealing arrangements specially adapted for windows or windscreens

Definitions

  • the present invention relates to a window, in particular a fixed side window of a transportation vehicle.
  • Fixed side windows of motor vehicles in particular those installed to the rear of the vehicle, such as the rear quarter lights, are generally provided, before fitting onto the bodywork, with a trim masking the edge of the window pane.
  • Fitting the window pane using this technique therefore requires a large number of sometimes complicated operations and consequently has a significant labour requirement.
  • window panes provided with peripheral frames overmoulded by the injection moulding of a plastic onto the window pane, in particular rear windows of motor vehicles, are also known.
  • the frame consists of an elastomer material, which is either thermoplastic or polymerized in situ using the technique of reaction injection moulding (RIM), in order to fulfil, in addition to its function of protecting the edges of a window pane, a sealing function.
  • RIM reaction injection moulding
  • This additional priming operation entails a non-negligible additional cost in the manufacture of the window pane.
  • Implementation of this expensive overmoulding or encapsulation technique proves not to be competitive for lower-functionality frames, in particular those essentially having a protective or aesthetic function.
  • the objective of the invention is to provide a window pane with a peripheral frame without any problem in their relative positioning, in a manner which is simple, reproducible, requires little labour and is relatively inexpensive.
  • the subject of the invention is an encapsulated window comprising a monolithic or laminated class and/or plastic substrate provided with a frame made of a plastic material which is overmoulded around the periphery of the substrate, characterized in that the frame includes, along at least part of its periphery, an essentially U-shaped groove which grips the border of the substrate and in that the plastic material consists of a thermoplastic polymer or of a blend of thermoplastic polymers having a flexural modulus of at least 1200 MPa.
  • FIG. 1 represents a cross-sectional view of a first window according to the invention
  • FIG. 2 represents a cross-sectional view of a second window according to the invention.
  • FIG. 3 represents a cross-sectional view of a third window according to the invention.
  • the frame may have a continuous longitudinal groove into which the border of the substrate is set around its entire periphery, or else may have only portions provided with a U-shaped groove.
  • the number, position and length of the said portions may be readily determined by the skilled person, depending in particular on the rigidity of the thermoplastic used or on the desired profile for the frame, so as to ensure that the frame is held in place on the substrate.
  • the frame is relatively flexible and it is preferable to provide segments having a U-shaped groove around the major part of the periphery of the frame in order to avoid any risk of dislodgement.
  • a thick overmoulded frame will not be very flexible and satisfactory retention will be achieved even with few of these segments having a groove.
  • the windows according to the invention may be provided with frames having a very wide range of cross-sections, having, in particular, in addition to the groove, other parts of defined shape which are intended to give the frame functional components present along its entire length, such as a longitudinal lip or which are limited to certain points or segments on the frame, such as alignment studs or positioning stops.
  • the overmoulded frame consists of a rigid thermoplastic polymer or a blend of rigid thermoplastic polymers, optionally containing an organic or inorganic filler, characterized by a flexural modulus, measured according to the NFT 51-001 standard, of at least 1200 MPa, preferably of from 1200 to 3000 MPa and most particularly approximately from 2000 to 3000 MPa.
  • the modulus may even reach much higher values.
  • This rigidity makes it possible, after the overmoulded plastic has cooled, to give the frame a gripping force sufficient to prevent the two legs of the U to move apart and to release the window pane.
  • the thermoplastic has a Shore D hardness of at least 60 and preferably of from 60 to 90.
  • the thermoplastic has a certain volume shrinkage in order to contribute to the gripping. However, this shrinkage must not be too pronounced in order to avoid the window pane breaking due to the effect of the stresses involved.
  • the thermoplastic has a volume shrinkage of approximately from 0.1 to 1%, preferably from 0.1 to 0.8% and in particular approximately from 0.1 to 0.5%.
  • thermoplastic polymer or polymers which can be used according to the invention. Mention may more particularly be made, as examples, of an unsaturated polyester, a polyamide, in particular nylon-6 or nylon-6,6, a polyolefin such as polypropylene, a rigid polyvinyl chloride, polystyrene, non-elastomeric polyurethane, polyacetal, polycarbonate, polyphenylene oxide, a copolymer of the styrene/acrylonitrile or acrylonitrile/butadiene/styrene type, and blends thereof.
  • an unsaturated polyester a polyamide, in particular nylon-6 or nylon-6,6, a polyolefin such as polypropylene, a rigid polyvinyl chloride, polystyrene, non-elastomeric polyurethane, polyacetal, polycarbonate, polyphenylene oxide, a copolymer of the styrene/acrylonitrile or acrylonitrile/butadiene
  • the overmoulded frame is held solidly in place just by the gripping force which is exerted because of its rigidity.
  • the invention makes provision for the possible application of an adhesion primer to the edge of the substrate, at least along part of its length, in order to promote adhesion of the overmoulded plastic only on the edge of the substrate. Since this is merely a supplementary measure, it is sufficient to limit the priming to the edge of the substrate. Despite what was said in the preamble, this alternative form remains advantageous as it requires only an approximate application of the primer to the edge of the window pane, contrary to the precise application around the entire marginal region of the substrate in the case of the overmoulding of elastomer materials.
  • the amount of primer composition used in this alternative form of the invention is therefore considerably smaller than in the prior art, and it is furthermore possible to treat several substrates at the same time by applying the primer composition to the edge of an entire stack of window panes. The rate and cost of production are therefore not substantially affected.
  • the primer which can be used according to the invention may be of any known type, in particular a silane-based primer.
  • the overmoulded frame with which the window is provided according to the invention has, in general, a shape matched to the future environment of the window and may, in particular, include various functional components such as, for example, positioning stops or fixing components which can be used for fitting the window into an opening. It may have continuous components present around the entire periphery of the frame, or else components of length limited to a particular segment of the frame resulting from a local modification of the profiled cross-section.
  • Such functional components may have a shape which protrudes beyond the body of the frame, for example in order to mask the space between the window pane and the bottom of the rebate or a gap in the bodywork.
  • this protruding element has an open structure and may act as a rear-side-panel aerator built into the window.
  • the functional components may be moulded with the rest of the frame in a mould having a constant cross-section or a suitable variable cross-section, but they may also be carried by inserts incorporated into the thermoplastic injected into the overmoulding mould.
  • a bead of deformable flexible material may be placed around the perimeter of the moulded frame, which bead, when the window is being fitted into an opening, will be pressed against the bottom of the rebate of the opening.
  • This bead which is not necessarily continuous or present around the entire perimeter of the frame, is capable of providing at least three advantageous effects; it limits the vibrations of the window in the opening; it reduces the problems of aerodynamic noise; and, when it has a sufficient coefficient of friction on the rebate, it ensures that the window is held in position while the applied adhesive is setting.
  • One material which can advantageously be used as this bead is a polyurethane foam which may be processed in various ways, in particular by the casting, injection moulding or extrusion, onto the frame, of a fluid or viscous material which cures in situ, or else by the bonding of a pre-extruded bead by means of a suitable adhesive.
  • this frame of these functional components, such as a shape protruding from the periphery of the window pane, or a component bonding to the opening, is made possible according to the invention by virtue of excellent retention of the frame due to the gripping force exerted by the rigid material overmoulded onto the substrate.
  • a conventional frame, prefabricated by moulding and then fitted onto the substrate, if it were provided with similar components would not be satisfactory since the forces resulting from the interaction of these components with their surrounding would irremediably affect the relatively weak mechanical bond between the frame and this substrate, with as consequence a high risk of dislodging the frame.
  • the window according to the invention is particularly suitable for many applications in which complete sealing between the window pane and the overmoulded component is not required.
  • a window may advantageously constitute a side window for a motor vehicle, fixed into an opening in the bodywork by means of an applied bead of adhesive deposited on the actual glass substrate, the frame simply acting as a trim and sealing between the window and the opening being provided by the bead of adhesive itself.
  • the rigid thermoplastic used according to the invention can be overmoulded using standard equipment, using the conventional steps: putting the substrate into the mould, closing the mould and applying pressure to it, injection moulding the thermoplastic in the viscous state, and, finally, cooling.
  • a single plastic material may be injection moulded according to the invention, but also several plastics may be used in the technique of coinjection moulding.
  • the invention is also compatible with more complex techniques such as gas-assisted injection moulding (GAIM).
  • GIM gas-assisted injection moulding
  • an inert gas typically nitrogen, is injected at the same time as the plastic material so as to for a channel, or at least bubbles, in the injected plastic in order to obtain a hollow frame and thus to save a non-negligible amount of plastic.
  • the cooling step is relatively critical since it is during cooling that the plastic starts to exert a gripping force on the border of the substrate.
  • the pressure applied in the mould in this step may advantageously be tailored to each thermoplastic depending on its volume shrinkage during cooling, so as not to subject the overmoulded substrate to stresses which would run the risk of weakening it or even of breaking it.
  • the cooling rate and the temperature gradient in the mould are other parameters to be considered.
  • the invention provides an improved overmoulding (encapsulation) process comprising a step of injection of a thermoplastic material into a mould in which the substrate has been placed beforehand, followed by a cooling step, characterized in that the heat treatment applied to the thermoplastic material during the cooling step is adjusted locally so as to control the volume shrinkage of the thermoplastic at each point on the overmoulded frame.
  • the temperature of the mould will advantageously be controlled in the cooling step by providing, for example, cooling channels suitably placed in the mould in order to impose different temperatures, and therefore different degrees of shrinkage, around the perimeter of the frame. In this way, it is possible to create gripping stresses which vary along the frame and thus to adjust the force of the bond between the frame and the substrate at each point on the latter.
  • the window 1 shown in FIG. 1 is intended to be fixed by adhesive bonding in a rear side panel 2 of a motor vehicle by means of an applied bead of adhesive 3.
  • a glass substrate 4 having, on its face turned towards the inside of the bodywork, a preparation layer 4a, such as a layer of opaque enamel, to which the bead of adhesive 3 adheres, and a peripheral frame 5 obtained by overmoulding a rigid thermoplastic material.
  • a rigid thermoplastic mention may be made in particular of a rigid polyvinyl chloride having a flexural modulus (according to the NFT 51-001 standard) of approximately 2000 MPa, a Shore D hardness of approximately 70 degrees and a volume shrinkage of 0.3%.
  • the frame 5 has a part of U-shaped cross-section into which the border 6 of the substrate 4 is set, this U-shaped part defining a longitudinal groove, the bottom 7 and the two side walls 8 and 9 of which are in contact with the border 6.
  • the frame 5 also includes a projecting part 10 in the form of a lip which extends to the outside of the substrate 4 and masks the bottom of the rebate made in the rear side panel 2.
  • FIG. 2 shows an alternative form of the invention in which an adhesive bond is made between the frame and the edge of the substrate.
  • the window 11, shown fixed in a rear side panel 12 by means of a bead of adhesive 13, comprises a glass substrate 14 which has an opaque coating 14a around the periphery of its internal face and the edge of the glass substrate is covered with a silane-based preparation primer 15, and a frame 16 whose cross-section has a U-shaped part into which the border of the substrate 14 is set, this U-shaped part defining a longitudinal groove whose bottom 17 is in contact with the layer of primer 15.
  • thermoplastic While the thermoplastic is being injection moulded in order to form the profile 16, the thermoplastic material chemically interacts with the primer layer applied to the edge of the substrate and an adhesive bond is created between the bottom 17 of the groove and the substrate by means of the layer 15.
  • thermoplastic making up the two side walls 18 and 19 of the U-shaped groove does not interact chemically with the untreated surfaces of the substrate 14 so that, after cooling, the two walls 18 and 19 exert merely a mechanical gripping action on the surfaces of the substrate due to the rigidity of the thermoplastic.
  • the profile 16 furthermore includes a longitudinal rib 20 intended to limit the expansion of the applied bead of adhesive 13 used for fixing the window to the rear side panel.
  • the rib 20 may be replaced by discrete positioning stops intended to fix the distance between the window 11 and the bodywork.
  • FIG. 3 illustrates another embodiment of the invention in which the glass substrate is gripped in the frame no longer continuously around its periphery but discontinuously, only at certain segments on the frame.
  • the frame 25 thus comprises segments of U-shaped cross-section alternating with segments having an L-shaped cross-section.
  • the section shown in FIG. 3 is produced through a segment having a U-shaped cross-section in which the frame comprises three walls 27, 28, 29 in respective contact with the external face, the edge and the internal face of the glass.
  • the marginal region 26 of the substrate is gripped in the rigid groove formed by these three walls.
  • the frame part shown to the rear of the plane of section comprises a long segment having two L-shaped walls in contact with the outer face and with the edge of the window pane, and another, shorter segment again having a U-shaped cross-section with a wall 29 in contact with the inner face of the substrate.
  • the window 21 furthermore includes a flexible bead 30, for example made of polyurethane foam, adhesively bonded to the external face of the wall 28 of the frame 25 and serving to damp the vibrations and the aerodynamic noise when the vehicle provided with the window 21 is travelling.
  • a flexible bead for example made of polyurethane foam, adhesively bonded to the external face of the wall 28 of the frame 25 and serving to damp the vibrations and the aerodynamic noise when the vehicle provided with the window 21 is travelling.
  • This bead furthermore makes it possible, by virtue of the friction exerted on the rebate 22, to keep the window 21 in place during the setting time of the applied bead of adhesive 23.
  • the frame 25 stays perfectly in place on the substrate 21 both during this application operation and during the subsequent use of the vehicle, despite the forces which will be transmitted to it by the bead 30.
  • the invention which has just been described in the case of a window for a motor vehicle, is in no way limited to this embodiment, but is suitable for very many types of window.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
US09/125,965 1996-12-30 1997-12-24 Encapsulated window and manufacturing process Expired - Lifetime US6134851A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9616184 1996-12-30
FR9616184A FR2757805B1 (fr) 1996-12-30 1996-12-30 Vitrage surmoule et procede de fabrication
PCT/FR1997/002422 WO1998029274A1 (fr) 1996-12-30 1997-12-24 Vitrage surmoule et procede de fabrication

Publications (1)

Publication Number Publication Date
US6134851A true US6134851A (en) 2000-10-24

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US09/125,965 Expired - Lifetime US6134851A (en) 1996-12-30 1997-12-24 Encapsulated window and manufacturing process

Country Status (12)

Country Link
US (1) US6134851A (de)
EP (1) EP0885135B1 (de)
JP (1) JP4179633B2 (de)
KR (1) KR100529589B1 (de)
BR (1) BR9707873A (de)
CZ (1) CZ291252B6 (de)
DE (1) DE69739555D1 (de)
ES (1) ES2332161T3 (de)
FR (1) FR2757805B1 (de)
PL (1) PL184961B1 (de)
RU (1) RU2188133C2 (de)
WO (1) WO1998029274A1 (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6332640B1 (en) * 1998-09-24 2001-12-25 Saint-Gobain Recherche Window with a profiled bead comprising a covering attachment
US20030000162A1 (en) * 2000-11-30 2003-01-02 Wener Gaiser Connection between the lower edge of a motor vehicle windshield and a water delector
US6622443B2 (en) * 1999-05-25 2003-09-23 Interface, Inc. Trim for high pressure laminate and other decorative floor coverings
US20060008625A1 (en) * 2004-07-12 2006-01-12 Guardian Industries Corp. Vehicle window unit with foam based seal and corresponding method
US20060287408A1 (en) * 2005-06-20 2006-12-21 Kiran Baikerikar Protective coating for window glass
US20080061517A1 (en) * 2006-08-17 2008-03-13 Fike Corporation Seal for sanitary overpressure vent structure
US20080145564A1 (en) * 2006-12-19 2008-06-19 Dow Global Technologies Inc. Adhesion promotion additives and methods for improving coating compositions
US20080152926A1 (en) * 2006-12-19 2008-06-26 Dow Global Technologies Inc. Composites and methods for conductive transparent substrates
US20080213545A1 (en) * 2006-12-19 2008-09-04 Dow Global Technologies Inc. Encapsulated panel assemblies and methods for making same
US20100319683A1 (en) * 2009-06-19 2010-12-23 Solfocus, Inc. Molded Securing Device for an Optical Element
US20110030277A1 (en) * 2009-08-07 2011-02-10 Magna Mirrors Of America, Inc. Window assembly for vehicle
US20130333295A1 (en) * 2011-03-11 2013-12-19 Central Glass Company, Limited Attachment Structure for Window Glass
US8776435B2 (en) 2012-07-03 2014-07-15 Magna Mirrors Of America, Inc. Window assembly for vehicle
US8800222B2 (en) * 2012-12-27 2014-08-12 Agc Automotive Americas R&D, Inc. Encapsulants for window assemblies
US20150239214A1 (en) * 2012-10-12 2015-08-27 Agc Automotive Americas R&D Inc. Encapsulants For Window Assemblies
EP1624012B2 (de) † 2003-05-12 2015-09-02 Teijin Chemicals, Ltd. Flächenförmiges fensterelement und fensteraufbau
CN106515999A (zh) * 2016-10-10 2017-03-22 江阴澳玛斯特游艇有限公司 钓鱼艇一体式侧门制备工艺
EP3323649A1 (de) * 2016-11-17 2018-05-23 Asahi Glass Company, Limited Scheibenkörper mit einem daran befestigten kunststoffrahmen für ein fahrzeug
US10167664B2 (en) 2015-09-09 2019-01-01 Magna Mirrors Of America, Inc. Window assembly for vehicle
US20190264493A1 (en) * 2018-02-27 2019-08-29 Taylor Made Group, Llc High strength window or door system
WO2021150228A1 (en) * 2020-01-23 2021-07-29 Volvo Truck Corporation Vehicle window subassemblies for initial bonded and subsequent roped installation
WO2023000070A1 (pt) * 2021-07-20 2023-01-26 Marcopolo S.A. Dispositivo de drenagem de janelas sem caixilho, processo de montagem de janela e veículo de transporte de passageiros
US11917848B2 (en) * 2019-08-27 2024-02-27 Samsung Display Co., Ltd. Protective window including protected edge glass substrate

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US6089646A (en) * 1998-01-12 2000-07-18 Donnelly Corporation Vehicular window assembly
US6293609B1 (en) 1998-01-12 2001-09-25 Donnelly Corporation Vehicular window assembly
US6086138A (en) * 1998-01-12 2000-07-11 Donnelly Corporation Vehicular window assembly
FR2779990B1 (fr) 1998-06-19 2000-07-21 Saint Gobain Vitrage Vitrage en matiere plastique avec ajout de matiere plastique surmoule
DE19837308A1 (de) * 1998-08-18 2000-02-24 Fritz Richard Gmbh & Co Kg Scheibeneinheit
JP3711887B2 (ja) * 2001-04-17 2005-11-02 トヨタ車体株式会社 ウインドモールの製造方法
FR2944471B1 (fr) * 2009-04-16 2011-05-06 Saint Gobain Vitrage a propriete d'amortissement vibro-acoustique ameliore, procede de fabrication d'un tel vitrage et procede de protection acoustique dans un habitacle de vehicule
US8650802B2 (en) * 2011-09-08 2014-02-18 Ford Global Technologies, Llc Vehicle (automobile) flush glass appearance assembly
RU2618572C1 (ru) * 2016-04-26 2017-05-04 Акционерное общество "Военно-промышленная корпорация "Научно-производственное объединение машиностроения" Способ крепления плоского защитного стекла иллюминатора
FR3063254B1 (fr) * 2017-02-27 2019-03-22 Saint-Gobain Glass France Procede d'encapsulation

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6332640B1 (en) * 1998-09-24 2001-12-25 Saint-Gobain Recherche Window with a profiled bead comprising a covering attachment
US6719351B2 (en) 1998-09-24 2004-04-13 Saint-Gobain Glass France Window with a profiled bead comprising a covering attachment
US6622443B2 (en) * 1999-05-25 2003-09-23 Interface, Inc. Trim for high pressure laminate and other decorative floor coverings
US20030000162A1 (en) * 2000-11-30 2003-01-02 Wener Gaiser Connection between the lower edge of a motor vehicle windshield and a water delector
US6748706B2 (en) * 2000-11-30 2004-06-15 Weidmann Plastics Technology Ag Connection between the lower edge of a motor vehicle windshield and a water deflector
EP1624012B2 (de) † 2003-05-12 2015-09-02 Teijin Chemicals, Ltd. Flächenförmiges fensterelement und fensteraufbau
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ES2332161T3 (es) 2010-01-27
KR19990087219A (ko) 1999-12-15
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FR2757805B1 (fr) 1999-01-29
RU2188133C2 (ru) 2002-08-27
EP0885135B1 (de) 2009-08-26
PL328469A1 (en) 1999-02-01
FR2757805A1 (fr) 1998-07-03
WO1998029274A1 (fr) 1998-07-09
KR100529589B1 (ko) 2006-02-13
PL184961B1 (pl) 2003-01-31
BR9707873A (pt) 1999-07-27
JP4179633B2 (ja) 2008-11-12
EP0885135A1 (de) 1998-12-23
JP2000507186A (ja) 2000-06-13
CZ275898A3 (cs) 1998-12-16

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